改性粉煤灰对含镍废水的吸附研究 (Ⅱ)

探讨了改性粉煤灰处理含镍废水的影响因素,结果表明:改性粉煤灰的除镍性能与废水pH值、吸附时间、反应温度等因素有关。当pH小于7时,吸附起主导作用,随着pH值的升高,沉淀逐渐起主导作用。通过动力学及热力学研究表明:改性粉煤灰对含镍废水的吸附符合班厄姆吸附动力学方程及Langmuir吸附等温式,即符合单分子层吸附理论,且为自发、吸热过程。 The influence factors of the modified fly ash on removal of Ni2+containing in wastewater were discussed.The results showed that the ability of the modified fly ash removing nickel depended on pH,contact time and temperature.When the pH<7,the absorption played a leading role;with the increasing of pH,the precipitation gradually played a leading role.The study of dynamics and thermodynamics showed that: the absorption of modified fly ash on removal of Ni2+ containing in wastewater accord with Bangham adsorption dynamic equation and Langmuir adsorption isotherm,and that squared with the single-molecule layer adsorption theory,also the spontaneous,endothermic process